Poor Kourtney! The reality star may not believe the rumors that Kendall and Scott hooked up, but HollywoodLife.com has EXCLUSIVELY learned that his partying with Kendall and her friends ‘until the sun was up’ has actually hit a ‘huge sore spot’ with Kourtney!

Kourtney Kardashian, 35, and Scott Disick, 31, have had their trust issues in the past over his partying, but now with the rumors swirling that Kendall Jenner, 19, and Scott have hooked up, HollywoodLife.com has learned that “this story is dragging it all up again” and has actually “opened up a wound” for Kourtney. Here’s what we know.

A rumor this like is definitely not an easy one to swallow, and while HollywoodLife.com has EXCLUSIVELY learned that Kourtney does not believe it, but that hasn’t stopped her from feeling ignored and insecure — especially with Scott hanging out with Kendall and her friends.

“It’s not that Kourtney believes Scott and Kendall have hooked up, but it’s still not a good situation. All these rumors are stressful for her, they get to her because she does have huge trust issues with Scott,” our insider revealed. “He has a wandering eye and he’s a huge flirt, she knows he flirts with girls when he’s out and most of them are Kendall‘s age so as ridiculous as this whole story is, it does open up a wound for her.”

That’s not all! “And then there’s the fact that Scott has partied a lot with Kendall and her friends, who are all so young and so gorgeous” our source continued.

“There was even one night were he went out all night with them, he didn’t get home until the sun was up, she was home with the kids and he was partying with girls in their 20’s,” our insider dished. “That is another huge sore spot, they had a huge fight over that and this story is dragging it all up again.”

Kourtney Kardashian — Why She Is Mad At Scott Over Kendall Hook Up Rumor

Even though Kourtney doesn’t believe the rumor that hasn’t stopped her from being upset with Scott and as HollywoodLife.compreviously reported, from being over the constant drama of the family.

“Kourtney doesn’t believe the rumor. She just doesn’t. She can’t. All this has done is reignite the disappointment she has for Scott and she’s desperately in need of time away from him and her entire family before she loses it,” our insider exclusively revealed. “This is the one time in her life that she hates being a Kardashian. She’s on the verge of a mental breakdown and she’s about to explode.”

What do YOU think, HollywoodLifers? Do you think that Kendall and Scott have hooked up? Let us know your thoughts below!